ncelab 08.20-s003 *E,NLRMOS "Non-local reference to members of struct/union not supported."

(Systemverilog) I declared an enum-type inside my struct, and I need to call the enum's built-in functions next(), first(), and name().  Unfortunately, irun refuses to compile the code:

module cpu_state_test;

typedef logic [3:0] t_cpu_pipe_state;
//typedef logic [3:0] t_cpu_pipe_flags;

typedef enum t_cpu_pipe_state {
  S_IDLE = 4'd0,
  S_WAIT = 4'd1,
  S_FET0 = 4'd2,
  S_EXM0 = 4'd3,
  S_EXM1 = 4'd4,
  S_EXWB = 4'd5,
  S_STAL = 4'd6,
  S_HALT = 4'd7
} te_cpu_pipe_state;

typedef struct packed {
  logic ex_div_by_0;      // 0
  logic fetch_unaligned;  // 1
  logic ex_carry;         // 2
  logic ex_overflow;      // 3
  logic ex_saturation;    // 4
  logic [26:0] ex_reserved;// [31:5]
} t_cpu_pipe_flags;

typedef struct packed {
  te_cpu_pipe_state pipe;
  t_cpu_pipe_flags  flags;
  logic [31:0] idata; // instruction-word
  logic [31:0] pc;    // program-counter
  logic [31:0] wddata;// (data) write
  logic [31:0] rddata;// (data) read
} t_cpu_state;

t_cpu_state cpu_state;

initial begin : main
  cpu_state.pipe = cpu_state.pipe.first();
  do begin
    $display("  (0x%0h): %s", cpu_state.pipe, cpu_state.pipe.name() );
    cpu_state.pipe = cpu_state.pipe.next();
  end while ( cpu_state.pipe !== cpu_state.pipe.first() );

  $display( "end of testing...");
  #1 $finish(2);
end : main
endmodule : cpu_state_test

irun: 08.20-s003: (c) Copyright 1995-2008 Cadence Design Systems, Inc.

  cpu_state.pipe = cpu_state.pipe.first();
                                      |
ncelab: *E,NLRMOS (./cpu_state_test.sv,38|38): Non-local reference to members of struct/union not supported.

Is this a temporary restriction of irun's Systemverilog compiler? Or is it a bug?  It seems like a member-call to a built-in function should be exempt from the restriction "non-local reference".